Imported Products › Knuckles Heavy Card Case Knuckles Heavy Card Case from $17.60 Impact-resistant rugged exterior storage casing built for transport security. Limit 8 colors maximum per print run selection. Size Scale: Select Size Scale Compact (75%) Standard (100%) Colossal (150%) Filament Style Tier: Select Filament Style Tier Standard FDM (Single Spool / Co-Extrusion Split) AMS Multicolor Premium (Multi-Spool Swap) Add To Cart Added! Impact-resistant rugged exterior storage casing built for transport security. Limit 8 colors maximum per print run selection.